Type-writer attachment.



0. BAN CROFT. TYPE WRITER ATTACHMENT. APPLICATION FILED APR. 17, 1913.

Patented Mar. 3, 1914.

, with an annular groove The flange 11 is adapted to OSCAR BANCROFT, OF WASHINGTON, DISTRICT OF COLUMBIA.

TYPE wBlTER ATTACHMENT.

Specification of Letters Patent.

Patented Mar. 3, 1914.

Application filed April 17, 1913. Serial No. 761,791.

To all when it may concern Be it known that I, Osoan BANOROFT, a citizen of the United States, residing at \Vashington, in the District of Columbia, have invented certain new and useful Improvements in Type-Writer Attachments, of which the following is a specification.

My invention relates to an improvement in attachments for typewriters, and the object is to provide means which will indicate or sound an alarm whereby the operator of the machine will be notified that the end of the sheet of paper being operated upon is approaching. K

The invention. consists in certain novel features of construction and combinations of parts which will be hereinafter fully described and pointed out in the claims.

In the accompanying drawings :-Figure 1 is a top plan view showing the invention in position with respect to an oscillatmg bar and platen of a typewriting machine, Fig. 2 is an end view of the apparatus shown in Fig. 1, but showing the platen in section, Fig. 3 is an end view of the device showing it in engagement with the platen, and Figs. 4 and 5 are perspective views of the device.

This invention is adapted more particularly for application to the L. C. Smith & Bros. and Monarch typewriters.

. A, represents a platen which is provided 1. An oscillating bar B is pivotally mounted upon a shaft 2. Mounted upon the bar B is a stop 4, which has a flange 5 provided with a tapering surface 6.

A portion of the platen frame or carriage C is disclosed inv Figs. 2 and 3, and on this frame is mounted a curved arm 7, the arm being pivotally connected to the frame by a link 8. Upon the lower end and on the upper side of the arm is a projection 9, WlllCll is adapted to normally enter the recess or groove 1 of the platen. Mounted upon the opposite end of the arm is a trip 10, which consists of two flanges 11 and 12 which extend at right angles to the body of the trip.

normally rest upon the frame C, as shown in Fig. 3. The flange-12 is provided with a beveled or tapered surface 13.

When the device is in Figs. 1 and 2, which show the paper E passed about the roll or platen, the pro ection 9 is held out of the recess or groove 1 of the platen, but as soon as the end of the use, as disclosed in sheet of paper passes the projection 9, the projection will immediately enter the annular groove, causing the trip to be brought into a position whereby it will come in contact with the stop 1, which is mounted upon the oscillating bar B. The beveled surface 13 will permit the arm 7 to pass the stop in one direction, but will cause the projection 9 to be moved from the recess. When the arm is moving'in the opposite direction, the trip 10 will come in contact with the stop 4: again, and the flange 12 will engage the beveled surface 6 of the stop, causing the bar B to be raised. The oscillation of this bar operates a bell 1 1, which is customary in this type of machine, thereby notifying the operator that the end of the sheet is approaching, and indicating to the operator that care should be taken in the operation of the machine to prevent writing too near the lower edge of the sheet. Often the rollers which carry the paper after the paper leaves the feed-rollers, are not sufiiciently strong to hold a sheet rigid, and when an operator endeavors to write alon the lower edge or portion of the sheet the alinement is often destroyed, because the small rollers allow the paper to shift or move upon the laten. The operator is notified that the end of the sheet of paper being operated upon is approaching upon the sounding of the bell; and the bell is caused to be sounded by the mechanism only when the carriage is being moved to a position for the beginning of a new line.

It will be seen that when the paper to be written upon is inserted upon the platen, that the tripping device is prevented from operating, and the projection or lug 9 is held out of engagement with the annular groove; but the moment the sheet passes, the projection 9 will enter the groove causing the trip 10 on the arm 7 to be brought into engagement with the stop 1, so as to cause the bell to be sounded.

The flange 11 of the trip rests upon the edge of the frame during the tripping operation. and the strain instead of being transmitted entirely to the arm 7 is taken up practically, if not entirely, by the trip 10 through the flange 11 which rests upon the frame C as shown in Fig. 3. I

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. The combination with a carriage-frame and platen having an annular groove therein, of an oscillatin bar having a stop thereon, an arm pivotal y mounted upon the carriage-frame, a projection on the arm adapted to enter the annular groove of the platen and a trip on the arm adapted to be brought into engagement with the stop on the oscillating bar for actuating the bar upon the entrance oi the projection in the groove.

2. The combination with a carriage, platen and a movable bar, said platen having the paper to be operated upon traveling thereover, an alarm adapted to be operated and a trip upon the arm adapted to engage the stop as the arm is released by the paper passing out of engagement therewith for actuating the bar to give an alarm.

In testimony whereof I afl'ix my signature, in the presence of two witnesses.

0%CAR BANGROFT. Witnesses:

J" D; YOAKLEY, WATTS T. ESTABROOK. 

